The fact that you only ever hear about ranked choice voting when you tell Democrat you're thinking of voting third part illustrates what their true objectives are.
(Also, I see third candidate parties in every midterm and local election I vote in at all levels of government. I have no idea what you're talking about).
(Also also, anyone reading this who lives in a swing state and hasn't voted yet, please, just votes for Harris. She sucks, but Trump is even more dangerous now that he has a staff full of enablers and an actual plan. We have to beat him.)
Well, third parties have always existed and will always exist, so it sounds like the Democrats need to get cracking on RCV. That is, unless they don't actually want RCV because it might disrupt the duopoly that empowers them, and they'd prefer that third-parties remain a boogeyman they can use to bully people I to voting for them (or a scapegoat for their losses).
Third parties run at all levels of government and they would actually benefit from eliminating first past the post polling far more than the major parties.
Because they care about maintaining their voters far more than enticing non-voters. If you listen to legislators and their staff for example, the way they perceive it is that non-voters may as well not exist in their minds, but eroding voters get attention.
I hate to say it, but the only way I could see it happen is if both parties simultaneously see significant 3rd/4th party challengers acting as spoilers. In that situation, RCV would be the short term solution to remove the effect of spoiler votes. Basically the situation the UK is in right now with both the Lib Dems and Reform.
I'm not an expert in it, but according to the Wikipedia link, they score the possible candidates to get down to two, and then they do an automatic runoff.